XX BIOLOGICAL SOCIETY OF WASHINGTON. 



Colorado Rivkk in California and Arizona. {Spermo- 

 philus mohavensis and .S". negledus).* Discussed by Mr. True. 



Dr. Cooper Curtice presented a paper entitled How Entozoa 

 CAUSE Disease. Discussed by Mr. Seaman, and Dr. Th. 

 Smith. 



Mr. F. W. True exhibited and discussed A Skull of a 

 Female Narwhal with two well-developed Tusks. 

 Discussed by Drs. Curtice, Merriam, Gill, and Messrs. Ward, 

 True, and Murdoch. 



Mr. L,. O. Howard presented Notes on Spider Bites. t 

 Discussed by Drs. Merriam, Fletcher, Smith, Marx, and Fox. 



One Hundred and Forty-sixth Meeting, 

 June i, 1889. 



The President in the chair, and thirty members present. 



Dr. C. Hart Merriam presented A Revision of the 

 Grasshopper Mice and Pocket Mice with Descrip- 

 tions of New Species.^ Discussed by Mr. True. 



Mr. C. D. Walcott read a paper entitled Descriptions of 

 New Genera and Species of Lower Cambrian Fos- 

 sils. S 



;: 1889. Merriam, C. Hart. Description of a new Spermophile from 

 Southern California {Spermophilus mohavensis\ N. Am. Fauna, No. 

 2, Oct. [889, 15-16. 



1SS9. Merriam, C. Hart. Description of a new Spermophile from 

 Northwestern Arizona [Spermophilus neglectus\ N. Am. Fauna, No. 



2, ( )ct. 1SS9, 1 7. 



t 1888. Insect Life, Vol. I, p. 347. 



: 1SN9. Merriam C. Hart. Descriptions of two new species and one 

 new subspecies of Grasshopper Mouse, with a diagnosis of the genus 

 ( hiychomys, and a synopsis of the species and subspecies. N. Am. 



Fauna, No. 2, Oct. [889, 1-5, pi. 1 and figs, in text. 



1SS9. Merriam C. Hart. Preliminary Revision of the N. A. Pocket 

 Mice (Genera Perognathus et Cricetodipus Auct.) with descriptions of 

 new species and subspecies and a key to the known forms. N. Am. 



Fauna, No. 1, Oct. 1889, t-29, pi. i-iv. 



\ [889. Proc. U. S. Nat. Mus. Vol. 12, pp. 34-46. 



